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A065603
as a simple table
n
a(n)
1
0
2
1
3
2
4
3
5
3
6
4
7
4
8
5
9
5
10
6
11
6
12
7
13
8
14
8
15
9
[0,1,2,3,3,4,4,5,5,6,6,7,8,8,9]